Furnace.



J. H. PARSONS.

PURNAOE.

APPLICATION FILED 00T. 29, 1907. 1,066,041. Patented July -1, 1913.

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JOHN H. PARSONS, OF PHILADELPHIA, PENNSYLVANIA, .ASSIGNOR TO PARSONS ENGINEERING COMPANY, 0F WILMINGTON, DELAWARE, A. CORPORATION 0F DELAWARE.

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Specification of Letters Patent.

Patented July l, 1913.

To all whom 25 may concern Be it known that I, JOHN I-I. PARSONS, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Furnaces, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to improvements in furnaces, and has for its object the provision of means facilitating the combustion of fuel with the resultant saving in the fuel and increased efficiency of the furnace.

'Ihe invention comprehends an attachment which may be readily put in place or removed frorn the re box of a furnace, formed to inject air, steam, or both, into the products arising from the burning fuel bed to insure complete combustion of said products.

The inventio-n embraces in a device of this character, a specially formed injecting nozzle having a heating portion passing over the fuel bed and one or more discharge portions directed baclwardly relative to said heating portion to supply the air to the products arising from the fuel in sufficient quantity to insurev practically complete combustion, the heating portion of the device being so arranged that said air in passing therethrough prior to its discharge is heated to substantially the point of ignition when commingled with the gaseous products from the re.

The invention also includes t-he device formed of sections, and means for securing the parts in operative and removable'relation.

All of the foregoing characteristics of the invention, and also other novel details in the construction and arrangement of parts will be fully understood from the detailed description hereinafter contained when read in connection with the accompanying drawings forming part hereof and wherein one convenient embodiment of the invention is illustrated. y

In the drawings: Figure 1 is a vertical longitudinal Sectional View, parts being broken away, through a steam boiler furnace of ordinary type having the improvements applied to the fire box thereof; and Fig. 2 is a transverse sectional view on the line K-X of Fig. l looking in the direction of the arrow.

Referring more specifically to the drawings wherein like reference characters refer to corresponding parts in the several views, A designates the fire box of a steam boiler furnace, B the bridge wall at the rear of the fire box, C the combustion chamber or area in rear of the fuel bed and above the bridge wall, D the water tubes, E the top of the lire box, F the grate bars thereof, and G the furnace charge opening.

Running transversely across the fire chamber in a plane near the bottom of the opening G is a horizontal ledge H and at the forward upper edge of the bridge wall B is a corresponding ledge I, while intermedi- `ate-the two and midway the re chamber is a supporting bar J, said ledges and bar c0- operating to support the grate bars F resting thereon.

The attachment constituting the present invention comprises an elongated substantially horizontally disposed pipe K preferably of fire-brick. One end of this pipe K is formed into a T-head L occupying a horizontal plane, as clearly seen in Fig. 2. The other end is formed into an elbow M directed downwardly substantially at right angles to the horizontal portionV of the pipe K. This pipe K is designed to occupy a position high up within the ire chamber A, as will be clearly seen from the drawings, the T-headed end thereof being supported by means of a lug le resting upon a ledge k above the furnace charge opening G, while the rear or elbowed end of the same has a shouldered portion m rest-ing upon the upper end of a section of pipe N also of fire-brick supported through the medium of a lug 'n resting upon the grate bar supporting ledge I. The elbowed portion M also has an annular collar or ange m surrounding the end of the pipe section N, the two sections K and N being connected in assembled operative relation by means of coupling pins m2 engaging registering apertures in the endV of the section N and the annular flange m. (Fig. l.) The lower end of the pipe section N constitutes the air inlet of the attachment, and projects down into and opens within the ash pit O. To this end, I also connect an injector nozzle P communicating with any suitable source of supply whereby to secure a greater force or supply of air through the attachment when desired. Owing to the arrangement of the device, it will be appreciated that some of the grate sections F immediately adjoining the pipe section N are relatively short and to support their rear endssaid section N is provided with a ledge n.

The extremities of the T-hoaded end L of the attachment are formed into nozzles Q of an elongated or flat type projecting rearwardly relative to the re box or back beneath ,the horizontal pipe K. The combined capacity of the outlets of the nozzles Q is slightly less than the capacity of the pipe K, whereby the heated air as it passes through the pipe K and gradually expands is discharged from the nozzles Q with considerable force and .in such volume as to pass the air overr the bed of -fuel without materially,consuming the oxygen in tlieair, whereby the greater volume .thereof isidelivered in the combustion area in rear of the fuel bed, where lit commingles with the products arising from the burning fuel, immediately .ignites, and consumes the same. The arrangement of the attachment is such that the air during the period vbetween its admission into the attachment and its discharge therefrom is heated to ,substantially the point of ignition when commingled with the gases or other products arising from the fuel bed. The :flat shape of the nozzles also insures a sheet of air passing backwardly through the combustion area to practically overhang all of the products arising from the 4fuel and insure contact with fthe air, while at the same time the general Vdirection of movement of the sheet of air is that of the draft through `the furnace, hence the draft is `not coniiicted with or impaired, but rather assisted lowing tothe force with which the air lpasses over the fuel. Under ordinary conditions, fthe force of the draft through the furnace stack and the heating and .expansion of the air as it is forced through the nozzles Q will be sufficient to carry the air over the fuel and obtain the results herein sought.

Itwill beappreciated that the attachment` .may be readily `installed in any furnace now. vin use with practically no alteration therein,

Y save perhaps the furnishing of the ledge Je',

to support the nozzle endof the device at the upper front end of the fire chamber.

I claim:

l. In combination with a furnace having the usual lire' box, grate and ash pit, of an air injecting attachment therefor arranged centrally ofthe fire box comprising an im- `perforate heater portion located at the rear 4of the fire box-therewithin, and-opening below the grate, an offset -elongated lnnperfor-ate heater portion constituting a continuation of said' first mentioned'portion extending forwardly within the `fire box, near the top thereof to near the forward wall of the same, nozzles at the end of said last mentioned heater portion arranged at opposite sides thereof to discharge air `from points adjacent said forward wall of the fire box rearwardly through the fire chamber in the general direction of the draft, substantially as described.

2. In combination with a furnace having the usual fire box, grate and ash pit, of-an air injecting attachment thereforarranged centrally of the fire box comprising an imperforate heater portion located at the rear of the fire box therewithin, andopening below the grate, an offset elongated limperforate heater portion constituting a continuation of said Erst mentioned port-ion extending forwardly within the fire box, near the top thereof to near the forward wall Aof the same, nozzles att-he en d yof said last mentioned heater portion arranged at opposite sides thereof to `discharge .air from points adjacent saidv forwarldwall of the re box rearwardly through the fire chamber in the` theusual fire box, grate and ashpit, ofalln air injecting attachment therefor arranged Vcentrally ofthe fire box comprising an imperforate heater `portion `located 'at the rear of the fi re box therewithin, and opening below the grate, gan odset elongated fimperforate heater portion constituting a continuation of said first mentioned portion extending forwardly within `the fire box, `nea-r ,thetop thereof to near'the forward wall of the same, nozzles at the end of said last men-n tioned heaterrportion arranged at opposite sides thereof to discharge air'from points adjacent said forward wall of the fire box rearwardly through *the fire chamber in the general direction ofthe draft, said .nozzles 4being fiat andfelongated transversely of the lire box vand inclining 'j downwardly to emit lthe air in merged sheet formation beneath the elongated heater portion thereabove, subl stantially as described.V

4l. vncombinatiOn with a furnace having the usualiire box, grateand ash pit, of an ,air injecting attachment thereforA comprising -an imperforate heater portion located at Y' the rear-,of the fire box -therewithim and opening below thegrate,van offset elongated imperforate heater portion separably connected to be lifted from and constituting a continuation ofsaid first mentioned portion `extending forwardly within thejfireboxnear` the tcp 'thereof to near rthe forward wallV ofV the same, and a nozzle at the end ofsaid last mentioned heater tportion arranged ,to discharge air-from a pomtjadjacent said 'forward wall of the fire box rearwardly through the lire chamber in the general direction of the draft, substantially as described.

5. In combination with a furnace having the usual fire box, grate andash pit, of an air injecting attachment therefor comprising an imperforate heat-er portion located at the rear of the fire box therewithin, and opening below the grate, an offset elongated imperforate heater portion separably connected to be lifted from and constituting a continuation of said first mentioned portion extending forwardly within. the firebox near the top'thereof to near the forward wall of t-he same, removable means for normally fastening the heater portions together, and a nozzle at the end of said last mentioned heater portion arranged to discharge air from a point adjacent said forward wall of the fire box rearwardly through the fire chamber in the general direction of the draft, substantially as described.

6. In combination with a furnace having the usual fire box, grate and ash pit, of an air` injecting attachment therefor comprising an iinperforateheater portion freely supported upon a part of the grate structure located at the rear of the fire box therewithin, and opening below the grate, an offset elongated imperforate heater portion constituting a continuation of said first mentioned portion extending forwardly within the fire box nearthe top thereof to near the forward .wall of the same, and a nozzle at the end of said last mentioned heater portion arranged to discharge air from a point adjacent said forward wall of the fi-re box rearwardly through the lire chamber in the general direction of the draft, substantially as described.

'7. In combination with a furnace having the usual fire box, grate and ash pit, of an air injecting attachment therefor comprising an imperforate heater portion freely supported upon a part of the grate structure located at the rear of the fire box therewithin, and opening below the grate, an offset elongated imperforate heater portion constituting a continuation of said first mentioned portion extending forwardly within the. fire box near the top therof to near the forward wall of the same, a nozzle at the end of said last mentioned heater portion arranged to discharge air from a point adjacent said forward wall of the fire box rearwardly through the fire chamber in the general direction of the draft, anda support adjoining said forward wall for the nozzled end of the attachment, substantially as described.

8. In combination with a furnace having the usual fire box, grate and ash pit, of an air injecting attachment therefor comprising an imperforate heater portion supported by a part of the grate structure located at `the rear of the fire box therewithin, and

opening below the grate, an offset elongated imperforate heater portion constituting a continuation of said first mentioned portion extending forwardly within the fire box near the top thereof to near the forward wall of the same, a nozzle at the end of said last mentioned heater portion arranged to discharge air from a point adjacent said forward wall of the fire box rearwardly through the fire chamber in the general direction of the draft, and means on the first mentioned heater portion constituting a part of the grate bars support.

9. In combination with a furnace having the usual fire box, grate and ash pit, of an air injecting attachment therefor comprising an upright imperforate heater portion located at the rear of the fire box supported on the rear grate bars supporting ledge and opening below the grate, means on said heater portion for supporting the grate bar or bars immediately adjoining the same, a horizontally disposed elongated imperforate heater portion constituting a continuation of said rst mentioned portion extending forwardly within the fire box near the top thereof to near the forward wall of the same, means adjoining said forward wall for supporting the end of said last mentioned heater portion, and a discharge nozzle at said end arranged to discharge air from a point adjacent said forward wall of the fire box rearwardly through the fire chamber in the general direction of the draft.

10. In combination with a furnace having the usual fire box, grate and ash pit, of supporting ledges at the rear and forward portions of the fire box, and an air injecting attachment for the furnace adapted to be maintained in operative position upon the insertion of the attachment in place in the fire box comprising an upright heater portion opening below the grate adapted to rest upon the rear ledge and be supported in approximately the plane of the grate, an offset elongated heater portion constituting a continuation of said first mentioned portion extending forwardly within the re box near the top thereof and supported by the forward ledge, and a discharge nozzle at the end of said last mentioned heater portion arranged to discharge air from a point adjacent the forward wall of the re box rearwardly through the re chamber in the general direction of the draft.

ll. In combination with a furnace having the usual re box, grate and ash pit, of supporting ledges at the rear and forward portions of the fire box, and an air injecting attachment for the furnace adapted to be maintained in operative position upon the insertion of the attachment in place in the fire box comprising a heater portion opening below the grate adapted to rest upon said last mentioned heater portion arranged to discharge air from a point adjacent the forward wall of the fire box rearwardly through the fire chamber in the general direction of the draft.

412. ln combination with a furnace having the 4usual fire box, grate and ash pit7 of an air injecting attachment therefor comprising a portion opening exteriorly of the ire .box7 an offset elongated iinpeiforate heater 7portion arranged .centrally of the lire box constituting` a continuation of said rst mentioned portion, said heater portion extending forwardly within thel fire box, and nozr ales :at the end of Saidheater portion arranged at Iopposite sides thereof to discharge heated air from points adjacent to the forward wall of the fire box rearwardly through the fire chamber in the general direction of the draft, .substantially as described. .f

In testimony whereof I affix my signature in presence of two witnesses.

Trios. Rl HEATH, J os. H. MILANS.

Copies of .this patent may be obtained'for ve cents each, by addressing ,the Commissioner of Patents,

Washington, D. C. 

